Sets

\[\xi=\{1,2,\ldots,10\},\] \[A=\{1,2,3,4,5,6\},\qquad B=\{2,4,6,8\}.\]

1. Find \(A'\cap B'\).

2. Find \((A\cup B)'\).

3. Find \((A\cap B)'\).

4. Which two answers are equal? Explain their common meaning.

5. Give one element showing why the remaining answer is different.